Extraction and sorption preconcentration of rare-earth elements(III) and scandium(III) with phosphorylmethyl-substituted butylphenylphosphinates from perchloric acid solutions

The interphase distribution of microamounts of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, and Sc perchlorates between aqueous HClO(4) solutions and solutions of bidentate phosphorylmethyl-substituted butylphenylphosphinates Oct(2)P(O)CH(2)P(O)Ph(OBu) (compound I) and Ph(2)P(O)CH(2)P(O)Ph(OBu) (compound II) in 1,2-dichloroethane is studied. The stoichiometry of extracted complexes is determined, and the efficiency of metal ion extraction into the organic phase is considered as a function of the HClO(4) concentration in the aqueous phase and the nature of the organic solvent. The possibility of concentrating rare-earth elements (REE)(III) and scandium(III) from HClO(4) solutions with the complexing sorbent synthesized by noncovalent immobilization of I and II compounds on a macroporuos polymer matrix is shown.